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2. Explain the errors that occur while making measurements.
3. Give reasons.
(a) It is not proper to measure quantities by using body parts as units.
(b) It is necessary to get the weights and measures standardized at regular
intervals.
4. Explain the need for accurate measurement
5. Write answers to the following questions in your own words.
(a) Why is the weight of the same object different on different planets?
(b) What precautions will you take to make accurate measurements in day-
to-day affairs?
(c) What is the difference between mass and weight?
Answers
Answer:Error in Measurement
Any measurement made with a measuring device is approximate.
If you measure the same object two different times, the two measurements may not be exactly the same. The difference between two measurements is called a variation in the measurements.
Error in Measurement 1Another word for this variation – or uncertainty in measurement – is “error.” This “error” is not the same as a “mistake.” It does not mean that you got the wrong answer. The error in measurement is a mathematical way to show the uncertainty in the measurement. It is the difference between the result of the measurement and the true value of what you were measuring.
The precision of a measuring instrument is determined by the smallest unit to which it can measure. The precision is said to be the same as the smallest fractional or decimal division on the scale of the measuring instrument.
Explanation:
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